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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
*/
#ifndef __ASM_ARC_PTRACE_H
#define __ASM_ARC_PTRACE_H
#include <uapi/asm/ptrace.h>
#include <linux/compiler.h>
#ifndef __ASSEMBLY__
typedef union {
struct {
#ifdef CONFIG_CPU_BIG_ENDIAN
unsigned long state:8, vec:8, cause:8, param:8;
#else
unsigned long param:8, cause:8, vec:8, state:8;
#endif
};
unsigned long full;
} ecr_reg;
/* THE pt_regs: Defines how regs are saved during entry into kernel */
#ifdef CONFIG_ISA_ARCOMPACT
struct pt_regs {
/* Real registers */
unsigned long bta; /* bta_l1, bta_l2, erbta */
unsigned long lp_start, lp_end, lp_count;
unsigned long status32; /* status32_l1, status32_l2, erstatus */
unsigned long ret; /* ilink1, ilink2 or eret */
unsigned long blink;
unsigned long fp;
unsigned long r26; /* gp */
unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
unsigned long sp; /* User/Kernel depending on where we came from */
unsigned long orig_r0;
/*
* To distinguish bet excp, syscall, irq
* For traps and exceptions, Exception Cause Register.
* ECR: <00> <VV> <CC> <PP>
* Last word used by Linux for extra state mgmt (syscall-restart)
* For interrupts, use artificial ECR values to note current prio-level
*/
ecr_reg ecr;
};
#define MAX_REG_OFFSET offsetof(struct pt_regs, ecr)
#else
struct pt_regs {
unsigned long orig_r0;
ecr_reg ecr; /* Exception Cause Reg */
unsigned long bta; /* erbta */
unsigned long fp;
unsigned long r30;
unsigned long r12;
unsigned long r26; /* gp */
#ifdef CONFIG_ARC_HAS_ACCL_REGS
unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
#endif
#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
unsigned long DSP_CTRL;
#endif
unsigned long sp; /* user/kernel sp depending on entry */
/*------- Below list auto saved by h/w -----------*/
unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
unsigned long blink;
unsigned long lp_end, lp_start, lp_count;
unsigned long ei, ldi, jli;
unsigned long ret;
unsigned long status32;
};
#define MAX_REG_OFFSET offsetof(struct pt_regs, status32)
#endif
/* Callee saved registers - need to be saved only when you are scheduled out */
struct callee_regs {
unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
};
#define instruction_pointer(regs) ((regs)->ret)
#define profile_pc(regs) instruction_pointer(regs)
/* return 1 if user mode or 0 if kernel mode */
#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
#define user_stack_pointer(regs)\
({ unsigned int sp; \
if (user_mode(regs)) \
sp = (regs)->sp;\
else \
sp = -1; \
sp; \
})
/* return 1 if PC in delay slot */
#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
#define in_syscall(regs) ((regs->ecr.vec == ECR_V_TRAP) && !regs->ecr.param)
#define in_brkpt_trap(regs) ((regs->ecr.vec == ECR_V_TRAP) && regs->ecr.param)
#define STATE_SCALL_RESTARTED 0x01
#define syscall_wont_restart(regs) (regs->ecr.state |= STATE_SCALL_RESTARTED)
#define syscall_restartable(regs) !(regs->ecr.state & STATE_SCALL_RESTARTED)
#define current_pt_regs() \
({ \
/* open-coded current_thread_info() */ \
register unsigned long sp asm ("sp"); \
unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
(struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
})
static inline long regs_return_value(struct pt_regs *regs)
{
return (long)regs->r0;
}
static inline void instruction_pointer_set(struct pt_regs *regs,
unsigned long val)
{
instruction_pointer(regs) = val;
}
static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
{
return regs->sp;
}
extern int regs_query_register_offset(const char *name);
extern const char *regs_query_register_name(unsigned int offset);
extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
unsigned int n);
static inline unsigned long regs_get_register(struct pt_regs *regs,
unsigned int offset)
{
if (unlikely(offset > MAX_REG_OFFSET))
return 0;
return *(unsigned long *)((unsigned long)regs + offset);
}
extern int syscall_trace_entry(struct pt_regs *);
extern void syscall_trace_exit(struct pt_regs *);
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_PTRACE_H */
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